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irreplaceable
irreprehensible
irrepressible
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irreproducible
irresistible
irresoluble
irresolute
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irruption

ir·rup·tion [ i rúpshən ] (plural ir·rup·tions)


noun 
Definition:
 
1. sudden appearance: a sudden, often violent appearance of something
the irruption of violence in everyday life

2. rapid increase: a very rapid and pervasive increase in the numbers of something, e.g. predators ( technical )
irruption of High Plains coyotes and other mammal predators

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